diff --git a/src/protocol/ipa_prf/prf_sharding/mod.rs b/src/protocol/ipa_prf/prf_sharding/mod.rs
index 29c29385d..636a41598 100644
--- a/src/protocol/ipa_prf/prf_sharding/mod.rs
+++ b/src/protocol/ipa_prf/prf_sharding/mod.rs
@@ -102,7 +102,6 @@ impl InputsRequiredFromPrevRow {
     pub async fn compute_row_with_previous<C, BK, TV, TS>(
         &mut self,
         ctx: C,
-        depth: usize,
         record_id: RecordId,
         input_row: &PrfShardedIpaInputRow<BK, TV, TS>,
         num_saturating_sum_bits: usize,
@@ -114,7 +113,6 @@ impl InputsRequiredFromPrevRow {
         TV: GaloisField,
         TS: GaloisField,
     {
-        println!("depth: {}, record_id: {}", depth, usize::from(record_id));
         let (bd_key, tv, timestamp) = (
             input_row.breakdown_key_bits(),
             input_row.trigger_value_bits(),
@@ -422,8 +420,6 @@ where
     assert!(BK::BITS > 0);
     assert!(TS::BITS > 0);
 
-    println!("histogram: {:?}", histogram);
-
     // Get the validator and context to use for Gf2 multiplication operations
     let binary_validator = sh_ctx.narrow(&Step::BinaryValidator).validator::<Gf2>();
     let binary_m_ctx = binary_validator.context();
@@ -446,8 +442,11 @@ where
     let first_row = first_row.unwrap();
     let rows_chunked_by_user = chunk_rows_by_user(input_stream, first_row);
 
+    let mut collected = rows_chunked_by_user.collect::<Vec<_>>().await;
+    collected.sort_by(|a, b| std::cmp::Ord::cmp(&b.len(), &a.len()));
+
     // Convert to a stream of async futures that represent the result of executing the per-user circuit
-    let stream_of_per_user_circuits = pin!(rows_chunked_by_user.then(|rows_for_user| {
+    let stream_of_per_user_circuits = pin!(stream_iter(collected).then(|rows_for_user| {
         let num_user_rows = rows_for_user.len();
         let contexts = ctx_for_row_number[..num_user_rows - 1].to_owned();
         let record_ids = record_id_for_row_depth[..num_user_rows].to_owned();
@@ -553,7 +552,6 @@ where
         let capped_attribution_outputs = prev_row_inputs
             .compute_row_with_previous(
                 ctx_for_this_row_depth,
-                i,
                 record_id_for_this_row_depth,
                 row,
                 num_saturating_sum_bits,